Universidad Complutense de Madrid
E-Prints Complutense

Dynamical control of correlated states in a square quantum dot

Impacto

Downloads

Downloads per month over past year

Creffield, Charles E. and Platero, G. (2002) Dynamical control of correlated states in a square quantum dot. Physical review B, 66 (23). ISSN 1098-0121

[img]
Preview
PDF
549kB

Official URL: http://dx.doi.org/10.1103/PhysRevB.66.235303


URLURL Type
http://journals.aps.org/Publisher


Abstract

In the limit of low particle density, electrons confined to a quantum dot form strongly correlated states termed Wigner molecules, in which the Coulomb interaction causes the electrons to become highly localized in space. By using an effective model of Hubbard-type to describe these states, we investigate how an oscillatory electric field can drive the dynamics of a two-electron Wigner molecule held in a square quantum dot. We find that, for certain combinations of frequency and strength of the applied field, the tunneling between various charge configurations can be strongly quenched, and we relate this phenomenon to the presence of anticrossings in the Floquet quasi-energy spectrum. We further obtain simple analytic expressions for the location of these anti-crossings, which allows the effective parameters for a given quantum dot to be directly measured in experiment, and suggests the exciting possibility of using ac-fields to control the time evolution of entangled states in mesoscopic devices.


Item Type:Article
Additional Information:

© 2002 The American Physical Society.
The authors would like to thank John Jefferson for helpful discussions and comments. This research was supported by the EU through the TMR program ‘‘Quantum Transport in the Frequency and Time Domains,’’ and by the DGES (Spain) through Grant No. PB96-0875.

Uncontrolled Keywords:Radiation; Molecule; Field.
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:33712
Deposited On:21 Oct 2015 17:58
Last Modified:21 Oct 2015 17:58

Origin of downloads

Repository Staff Only: item control page